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1Fonds Perrone
By Engels, Friedrich, Kautsky, Karl, Vandervelde, Emile, Adler, Friedrich, Bauer, Otto
Date 1924 -
2Bibliotheek François Vercammen
Themanummer van Workers' Liberty, nrs. 46-47, April 1998
By Engels, Friedrich, Kautsky, Karl, Luxemburg, Rosa, Trotski, Leon, Matgamna, Sean
Date 1998